Generalized Axial Stress-Strain Response of Rectangular Columns Confined Using CFRP Jackets and Anchors
Publication: Journal of Composites for Construction
Volume 21, Issue 1
Abstract
The results of an experimental study of the cyclic axial stress-strain response of rectangular concrete columns confined with a combination carbon-fiber-reinforced polymer (CFRP) jacket and CFRP anchors are presented and discussed. The test variables include aspect ratio of the column section, area of CFRP wraps, and area and configuration of the CFRP anchors. It was found that adding CFRP anchors improves the confinement effectiveness of the CFRP jackets, leading to substantially enhanced envelope stress-strain response and ductility of axial failure. Furthermore, changing the anchor configuration while maintaining the total anchors’ cross-sectional area does not produce a noticeable effect on the envelope stress-strain curve. The cyclic part of the stress-strain response of the CFRP-anchored specimens is similar to that of the companion specimens confined with CFRP sheets without anchors. Based on the results of this study, analytical expressions are derived for predicting the stress-strain curve, taking into account the effect of CFRP anchors. The proposed model is able to predict the envelope and cyclic responses of concrete columns confined with CFRP sheets only and columns confined with a combination of CFRP sheets and anchors.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The authors acknowledge the financial support provided by the Lebanese National Council for Scientific Research (LNCSR). The authors are most grateful for that support and to the Faculty of Engineering and Architecture at the American University of Beirut (AUB) for providing the test facilities.
References
Caggegi, C., Pensée, V., Fagone, M., Cuomo, M., and Chevalier, L. (2014). “Experimental global analysis of the efficiency of carbon fiber anchors applied over CFRP strengthened bricks.” Constr. Build. Mater., 53, 203–212.
Campione, G., and Miraglia, N. (2003). “Strength and strain capacities of concrete compression members reinforced with FRP.” Cem. Concr. Compos., 25(1), 31–41.
Hany, N., Hantouche, E., and Harajli, M. (2015). “Axial stress-strain model of CFRP confined concrete under monotonic and cyclic loading.” J. Compos. Constr., 04015004.
Harajli, M., Hantouche, E., and Soudki, K. (2006). “Stress-strain model for fiber-reinforced polymer jacketed concrete columns.” ACI Struct. J., 103(5), 672–682.
Harajli, M. H., and Hantouche, E. G. (2014). “Effect of active versus passive confinement on seismic response of wide RC columns with lap splices.” J. Struct. Eng., 04014221.
Ilki, A., Peker, O., Karamuk, E., Demir, C., and Kumbasar, N. (2008). “FRP retrofit of low and medium strength circular and rectangular reinforced concrete columns.” J. Mater. Civ. Eng., 169–188.
Karantzikis, M., Papanicolaou, C. G., Antonopoulos, C. P., and Triantafillou, T. C. (2005). “Experimental investigation of nonconventional confinement for concrete using FRP.” J. Compos. Constr., 480–487.
Kim, I., Jirsa, J. O., and Bayrak, O. (2011). “Use of carbon fiber-reinforced polymer anchors to repair and strengthen lap splices of reinforced concrete columns.” ACI Struct. J., 108(5), 630–640.
Kim, Y., Quinn, K., Ghannoum, W., and Jirsa, J. (2014). “Strengthening of reinforced concrete T-beams using anchored CFRP materials.” ACI Struct. J., 111(5), 1027–1036.
Lam, L., and Teng, J. G. (2001). “Strength of RC cantilever slabs bonded with GFRP strips.” J. Compos. Constr., 221–227.
Lam, L., and Teng, J. G. (2003). “Design-oriented stress-strain model for FRP-confined concrete in rectangular columns.” J. Reinf. Plast. Compos., 22(13), 1149–1186.
Mander, J. B., Priestley, M. J. N., and Park, R. (1988). “Theoretical stress-strain model for confined concrete.” J. Struct. Eng., 1804–1826.
Orton, S. L., Jirsa, J. O., and Bayrak, O. (2008). “Design considerations of carbon fiber anchors.” J. Compos. Constr., 608–616.
Ozbakkaloglu, T., and Oehlers, D. J. (2008). “Manufacture and testing of a novel FRP tube confinement system.” Eng. Struct., 30(9), 2448–2459.
R 0.97.551 [Computer software]. (2012). RStudio, Boston.
Tan, K. H. (2002). “Strength enhancement of rectangular reinforced concrete columns using fiber-reinforced polymer.” J. Compos. Constr., 175–183.
Wang, Z., Wang, D., Smith, S., and Lu, D. (2012a). “CFRP-confined square RC columns. II: Cyclic axial compression stress-strain model.” J. Compos. Constr., 161–170.
Wang, Z., Wang, D., Smith, S., and Lu, D. (2012b). “Experimental testing and analytical modeling of CFRP-confined large circular RC columns subjected to cyclic axial compression.” Eng. Struct., 40, 64–74.
Information & Authors
Information
Published In
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Jan 2, 2016
Accepted: Apr 20, 2016
Published online: Jun 22, 2016
Discussion open until: Nov 22, 2016
Published in print: Feb 1, 2017
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.